PfeREZ FARFANTE: ROCK SHRIMP GENUS SICYONIA 



Material. — 5 specimens from 5 lots. 



Mexico— Id paratype, ZMB 6097, "California. 

 Forrer" (?Ferrer). Baja California Sur: 16, 

 SIO, Bahia Almejas, 11-24 m, 30 November 1961, F. 

 H. Berry. IS , CAS, off Cabo San Lucas, 6 August 

 1932, Zaca stn D-21R. 



Panama— 19, USNM, off Isla Taboga, Golfo de 

 Panama, 10 March 1969, H. A. Clarke and A. 

 Rodaniche. 



Peru— 19, IMARPE, off Puerto de Eten, 27 

 April 1983, M. Niquen, Humboldt, stn 8304, haul 

 175. 



Sicyonia hrevirostris Stimpson 1871 

 Figures 21-25 



Sicyona cristata. de Saussure 1857:306. [Not 

 Hippolyte cristata De Haan 1844:194 = Sicyonia 

 cristata (De Haan 1844).] 



Sicyonia hrevirostris Stimpson 1871:132 [syntypes 

 not extant; type-locality: S. Florida coast]. 

 Kingsley 1878:69. Faxon 1896:162. De Man 

 1911:10. Pesta 1915:118. Hay and Shore 

 1918:380, pi. 25, fig. 4. Hedgpeth 1953:160. 

 Hildebrand 1954:268, 1955:220. Menzel 1956: 

 41. Lunz 1957:4. Anderson 1958:1, fig. 5. 

 Eldred 1959:5. Gunter and McCaughn 1959: 

 1194. Anderson 1962:1, fig. 15. Kutkuhn 

 1962:2. Chapa Saldaha 1964:4. Joyce 1965: 

 132. Cerame-Vivas and Gray 1966:263. 

 Joyce 1968:254, unnumbered fig. Rouse 

 1969:136. Bayer et al. 1970:41. Zyznar 

 1970:87. Brusher et al. 1972:75. Cain 

 1972:79. Franks etal. 1972:54. Allen 1973:1. 

 Cobb et al. 1973:7, fig. 3, 4A-C. Day et al. 

 1973:36. Bryan and Cody 1975:1. Brusher 

 and Ogren 1976:158. Hooks et al. 1976:103. 

 Kennedy et al. 1977:1. Perez Farfante 

 1978: Sicyoniidae. Huff and Cobb 1979:51. 

 Wenner and Boesch 1979:130. Holthuis 

 1980:58. Perez Farfante 1980:772. Soto 

 1980a:68, 1980b:84. Castille and Lawrence 

 1981:519. Wenner and Read 1981:4. Arre- 

 guin Sanchez 1981:21. Perez Farfante 1982: 

 370. Wenner and Read 1982:181. Williams 

 1984:43. 



Eusicyonia edwardsi. Hay and Shore 1918, pi. 25, 

 fig. 2. [Not Sicyonia edwardsii Miers 1881:367 

 = Sicyonia typica Boeck 1864.] 



Eusicyonia hrevirostris. Burkenroad 1934a: 84, 

 1934b:117, 1939:57. Lunz 1945:4. Anderson 

 et al. 1949:16. Anderson 1956:2. McConnell 

 1960:52. 



Vernacular names: rock shrimp, hardback 

 (United States); camaron de piedra, camaron 

 conchiduro, camaron de roca (Mexico). FAO 

 names (Holthuis, 1980): rock shrimp (English); 

 camaron de piedra (Spanish); boucot ovetger- 

 nade (French). 



Cobb et al. (1973) and Huff and Cobb (1979) 

 presented extensive bibliographic references to 

 this species, many of which are omitted from the 

 above synonymy. 



Diagnosis. — Antennal spine well developed and 

 projecting from strong buttress. Second abdominal 

 somite with dorsomedian carina lacking incision. 

 First pereopod with basis and ischium unarmed. 

 Postrostral carina bearing three teeth posterior to 

 level of hepatic spine, rarely anterior one of these 

 at level of or slightly anterior to hepatic spine. 

 Rostrum armed with two dorsal teeth (rarely 

 three). Petasma with distal projection of dorsolat- 

 eral lobule relatively short, its apical part curved 

 dorsally. Thelycum with plate of sternite XIV al- 

 most flat or slightly raised laterally in paired low 

 bulges; posterior component traversed by well- 

 marked suture. Branchiostegite lacking large spot 

 or ocellus. 



Description. — Body robust (Fig. 21). Carapace 

 with dorsum covered by densely set, short setae; 

 also patches of setae present anterior and ventral 

 to hepatic spine, subjacent to hepatic sulcus and to 

 branchiocardiac carina, and band of smaller setae 

 on ventral part of branchiostegite. Patches also 

 present on terga of abdominal somites. Abdomen 

 heavily or moderately tuberculate, tubercles 

 small, more numerous on first four somites. 



Rostrum short, in young not overreaching distal 

 end of second antennular article, in adults falling 

 considerably short of distal margin of eye, its 

 length increasing linearly with carapace length 

 (Fig. 22), to about 16 mm cl, then growing little, 

 rarely surpassing 6 mm (proportional length de- 

 creasing with increasing size from as much as 0.49 

 to as little as 0.15 cl); subhorizontal or upturned as 

 much as 85°, tapering from base to tip, and armed 

 with two (very rarely three) dorsal and two or 

 three (four in one) apical teeth; latter subequal or 

 ventral one extending farther anteriorly than dor- 

 sal and often upturned; when two teeth present, 

 knob usually between them. Adrostral carina 

 strong, bordering ventral margin and reaching 

 end of rostrum. 



Carapace with postrostral carina high, bearing 



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